Air-release device



IVVENTOH MAoQoC/f) ATTORNEYS june 26, 1923.

Patented dune 225:3, i923.

wanfrnnn. n'. nrnnnocn, or nniviinfroiv, non/rrr DAKOTA.

`AIR`PUELEASE DEVICE.

Application ledl-lprl lll, 1921. Serial No. 461,214.

TeaM/whom 'may concern.'

Be it known that Lilli/'Armin A E. MAD- nooir, a citizen of the UnitedStates, and resident of Hamilton, in the county of Pembina and State ofNorth Dakota, have invented certain new and useful Improvements inAir-Release Devices, of which the following); is a specification.

This invention rela-testo air releasiim` devices especially adapted foruse in connection with pneumatic tires.

Briefly stated, an important object of this invention is to provide anair release device having' simple means whereby the same may be readilyattached to a valve stem for unseating the valve, and thereby permit airto escape from the tire. y

[i further object is to provide an air releasing device which .is ofhighly simplified construction, durable in use, and cheap tomanufacture.

Other objects and advantages vention will be apparent during' of thefollowing' description.

in the accompanying drawing:

Figure l is a perspective view `ofthe device applied. l

Figure 2 is a vertical sectional view through the same applied.

of the inthe course Figure 3 is a detail longitudinal sectional` viewthrough a slight modification invention.

In the drawing, the numeral 5 designates the valve stem of a tube 6, thesaid tube being' located within a casing 7.

The improved air releasing device consists of an exteriorly` knurledtubular body 9 having its forward portion interiorly threaded forthreaded engagement with the terminal portion of the valve stem 5. Itwill be seen with reference to Figure 2 that a cone-shaped head 1l isarranged within the tubular body 9 at a point spaced rearwardly of theforward end thereof and the forward pointed end of the cone-shaped headll is adapted to engageI the valve 1li so as to unseat the same.

Figure 2 illustrates that the rear portion of the cone-shaped head lland the adi acent of the portion of the tubular body 9 are provided endof the cone-shaped body ll is engaged `with the valve lso to unseat thesame,

whereupon the air passes through the perforations 2O and through thetubular body 9.

The rear portion of the tubular body is reduced in cross sectional areato form a narrow outlet opening 25 for the air and as the opening` 25 isconsiderably smaller than the bore ofthe tubular body 9 foreign mattercannot freely enter the tubular body portion provided with a cone-shapedexteny sion l? adapted for engaging' 'the valve, whereby `to unseat thesame. In this case the cone-shaped extension i? is surrounded by aseries of apertures 4S through which the released air travels. y

Figure 3 also illustrates that the head and the tubular body i0 areformed with interiittingrJ annular beads 49 and 50, re-

spectively, by means of which the head is securely held in position.

lllith reference to the foregoing; description .taken in connection withthe accom-` panying drawing, the highly simplified construction'andutility of this invention will be apparent.

Having thus described my invention, what l: claim is As an article ofmanufacture, an air releasing; device for tire valves comprising atubular body having,f its forward portion interiorly threadedforengaging 'the threads of a valve stem, a cone shaped perforated headfitted in the forward portion of said body at a point spaced from thescrew threads and having; a pointed forward end for engaging anddepressing the valve, the rear portion of said head and adjacent portionof the tubular body being formed with inwardly pressed. interfittingannular beads forming an attachingmeans for the head, the'rear portionof the tubular body being; reduced in cross sectional area tofform asmall air outlet opening, and to prevent foreign matter from freelyentering the tubular body.

WALTER A. E. MADDOCK.

